Abstract: An electronic device includes a motherboard, a bridging device, and an add-in card. The motherboard includes a processor, a first circuit board, and a first connector. The processor is coupled to the first connector through the first circuit board. The bridging device includes a second circuit board and a second connector and is disposed on the motherboard and coupled to the first connector. The second connector is coupled to the first connector through the second circuit board. The add-in card includes a third circuit board and a peripheral circuit and is disposed on the bridging device and coupled to the second connector. The peripheral circuit is coupled to the second connector through the third circuit board. The processor is coupled to the peripheral circuit through a signal path including the first circuit board, the first connector, the second circuit board, the second connector, and the third circuit board.

Abstract: A signal testing device and a signal testing method are provided. The method includes: obtaining, through a probe, a first frequency response corresponding to a test fixture and a device under test (DUT); obtaining, through the probe, a second frequency response corresponding to the test fixture; and generating a frequency response corresponding to the DUT according to the first frequency response, the second frequency response, a de-embedding algorithm, and an empirical mode decomposition algorithm.

Abstract: An electronic device includes a motherboard, a bridging device, and an add-in card. The motherboard includes a processor, a first circuit board, and a first connector. The processor is coupled to the first connector through the first circuit board. The bridging device includes a second circuit board and a second connector and is disposed on the motherboard and coupled to the first connector. The second connector is coupled to the first connector through the second circuit board. The add-in card includes a third circuit board and a peripheral circuit and is disposed on the bridging device and coupled to the second connector. The peripheral circuit is coupled to the second connector through the third circuit board. The processor is coupled to the peripheral circuit through a signal path including the first circuit board, the first connector, the second circuit board, the second connector, and the third circuit board.